-I-毕业设计论文摘要随着移动通信技术的发展，以前在数字通信系统中采用FSK、ASK、PSK等调制方式，逐渐被许多优秀的调制技术所替代。本文主要介绍了QPSK调制与解调的实现原理框图，用MATLAB软件中的SIMULINK仿真功能对QPSK调制与解调这一过程如何建立仿真模型，通过对仿真模型的运行，得到信号在QPSK调制与解调过程中的信号时域变化图。通过该软件实现方式，可以大大提高设计的灵活性，节约设计时间，提高设计效率，从而缩小硬件电路设计的工作量，缩短开发周期。关键词QPSK，数字通信，调制，解调，SIMULINK-II-毕业设计论文AbstractAsmobilecommunicationstechnology,andpreviouslyintheadoptionofdigitalcellularsystem,ASK,FSKPSKmodulation,etc.Graduallybeenmanyexcellentmodulationtechnologysubstitution,wherefourphase-shiftkeyingQPSKtechnologyisawirelesscommunicationstechnologyinabinarymodulationmethod.ThisarticleprimarilydescribesQPSKmodulationanddemodulationoftheimplementationoftheprincipleofblockdiagrams,focusesontheMATLABSIMULINKsoftwareemulationinonQPSKmodulationanddemodulationtheprocesshowtobuildasimulationmodel,throughtheoperationofsimulationmodel,IgetsignalinQPSKmodulationanddemodulationadjustmentprocessdomainchangefigure.Thesoftwareimplementation,candramaticallyimprovethedesignflexibility,savingdesigntime,increaseefficiency,designtoreducetheworkloadofhardwarecircuitdesign,andshortenthedevelopmentcycle.KeywordsQPSK,DigitalCommunication,modulation,demodulation,SIMULINK目录-III-毕业设计论文摘要...............................................................................................................................IAbstract..........................................................................................................................II第1章绪论..................................................................................................................11.1选题的目的和意义.........................................................................................11.2课题研究现状.................................................................................................11.3本文主要研究工作.........................................................................................2第2章数字通信技术简介..........................................................................................32.1引言.................................................................................................................32.2概念及其基本组成部分.................................................................................32.3数字通信的特点............................................................................................52.4数字通信发展的回顾与展望.........................................................................5本章小结................................................................................................................6第3章数字相位调制..................................................................................................73.1数字基带传输系统.........................................................................................73.2正弦载波数字调制系统................................................................................83.3QPSK概述......................................................................................................93.4QPSK调制和解调........................................................................................103.4.1调制................
